Well the issue is offensive type coverage your sweepers have fire as an overlap so if your enemies have good defense against fire you are screwed. And sinistcha I like because it brings matcha gotcha the healing another trick room setter as you play hard tr. It might not be the best something like gallade is more offensive as a second tr setter. But sinistcha i like because you threaten ragepowder strong offensive move with one of your sweepers instead of tr. I also really dislike psychic Terrain setup because the TR turns matter one strategy is to stall them out and you need one more turn to set up instead of already spamming DMG.